I know the sandstone ones that were included in a couple of my orders didn't last too long in my pocket. I wouldn't feel too comfortable carrying anything but stainless in my pocket, but that goes with every day objects, Other than my wallet everything is metal or it doesn't last too long. (Even my poor old wallet could use replacing)

I learned a long time ago the wisest thing I can do is be on my own side, be an advocate for myself and others like me. -Maya Angelou
michael@shapeways.com Community Advocate